Spending a year within Abaddon, not even pursuing their quest but just sitting tight in the a jungle, was not exactly how Lex wanted to spend his time. He had wanted to complete the quest as quickly as possible, but some things were not in his control.
Instead of worrying about it, he adapted his mindset. If he fixated on completing the quest as quickly as possible, this delay would have made him extremely agitated and frustrated, so instead he focused on gaining the most out of this quest, for himself and the Inn.
After a year in the jungle, all 500 of the staff members he had brought along were now ready to enter the Earth Immortal realm, but had held off on taking the tribulation because, well, anyone with any common sense could tell that no tribulation was going to be normal within Abaddon.